Hi,
I am currently restoring my girlfriend's (she has a good taste in cars) 1957 Dodge Coronet.
It is done as a total frame-off, and i recently built a rotisserie to take care of the body, as it is badly rusted.
The worst places is:
Inner and outer rocker panels
All 4 floor pans
Misc. holes around in the corners and such

I've welded a lot, and restored some cars in the past, but haven't gone through a job like this before.

I have to cut the rusted sections out and replace the sheet metal. But how do i make it, without risking the body to get out of shape while in the rotisserie?

Any tips for replacing it sectionwise, reinforcing the parts i will cut out, etc., etc.?

Picture below: Just got the body up 'n swirling!

 

You should have welded in some supports, something like a X brace door to door before any cutting

 

Google Image search: Reinforce car on rotisserie.

 

I bought a custom rotissorie that I can locate & brace just about every structural piece in the floor of the car

I can locate floor braces & all, essentially I can dissect a car on it as it will form a jig for it as I go

You do it with yours

 

Like previously mentioned..... lots of bracing prior to cutting!

 

Do some measuring and see if you could use a later B body floor pan